can the units be switched from psi to "WC?

Yes I used mine for measuring LP gas pressures.

What is the thread size of the barb metal connector - 1/4 in. or 3/8 in?

The hose Barbs appears to be molded into the housing, for the supplied 1/8" ID dia hose.

why are there 2 connector ports?

Second port is for measuring differential pressure, not needed if only reading pressure, and there is a positive and negative.

Why does it read -.018"H2O without even taking the measurement? That would be quite an error.

Because it hasn’t been “zero’d” yet.

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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プロフェッショナルエア圧力メーター)マノメーター、差動圧力ゲージHVACガス圧力テスター測定範囲: ± 20.68 KPA / ± 2.999 PSI

プロフェッショナルエア圧力メーター)マノメーター、差動圧力ゲージHVACガス圧力テスター測定範囲: ± 20.68 KPA / ± 2.999 PSI

Product ID: 724880648

Details

Brand
Leaton
Material
(ABS)
Item dimensions L x W x H
16 x 8 x 3 cm
Item Weight
200 Grams
UPC
663751079864

⚡0.5s fast response time

💡Large LCD backlight display

📏±20.68 kPa / ±2.999 PSI range

Description

📊 Elevate Your Pressure Game with Precision & Durability!

READ ANYTIME ANYWHERE - Large 4.95x4.45cm LCD with backlight ensures crystal-clear visibility even in dimly lit environments—never miss a critical measurement.
CONFIDENCE BACKED BY WARRANTY - Enjoy peace of mind with a 3-year free parts replacement guarantee—because your professional tools deserve professional support.
SMART DATA AT YOUR FINGERTIPS - Integrated data storage and DIF mode let you effortlessly record and review measurements, while low battery alerts keep you powered up and ready.
PRECISION THAT POWERS YOUR PROJECTS - Achieve ultra-accurate pressure readings with ±0.3% FSO accuracy and ±0.2% reproducibility—engineered for flawless HVAC and gas system diagnostics.
BUILT TO ENDURE DESIGNED TO IMPRESS - Crafted from high-durability ABS with heat and shock resistance, this manometer thrives in tough industrial settings for long-lasting reliability.

The Leaton Professional Air Pressure Manometer offers a precise ±20.68 kPa (±2.999 PSI) measurement range with ±0.3% FSO accuracy, featuring a large backlit LCD for easy reading. Built from robust ABS material, it withstands high temperatures and shocks, making it ideal for HVAC, gas pressure troubleshooting, and lab testing. Fast 0.5-second response time, data storage, and low battery alerts enhance usability, all backed by a 3-year warranty for professional reliability.

Specifications

ASIN	B07CWQJD6D
Brand	Leaton
Brand Name	Leaton
Customer Reviews	4.4 out of 5 stars 809 Your Review
Item Dimensions	16 x 8 x 3 cm
Item Weight	200 Grams
Item dimensions L x W x H	16 x 8 x 3 cm
Manufacturer	leaton
Material	アクリロニトリルブタジエンスチレン (ABS)
Material Type	アクリロニトリルブタジエンスチレン (ABS)
Model	QX-1201
Part Number	T68
UPC	663751079864

Reviews

B**.

Nice product

23.04.2026

P**S

Manometer

5.08.2025

M**S

Cumple su fin

Bastante útil para medir perfiles de velocidad en función de la presión estática y absoluta, aunque el juego de conexiones que compré solo tiene el detalle de que los tubos pitot L no están perforados de la boquilla

16.01.2026

O**G

Good product but requires proper zero setting

28.04.2026

R**D

HVAC work at home

7.05.2026

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